The algorithm has retrieved 134 women, for a total of 240 pregnancies, from 2000 to 2020.
543 records were reconciled to build the pregnancies.
Pregnancies are retrieved from four different streams:
PROMPTS: records from birth records, pregnancy termination records, and abortion records in SURVEY_ID: the existence of one of these records easily implies that a pregnancy is terminated
EUROCAT: records from EUROCAT table
CONCEPTSETS: diagnostic codes from EVENTS or procedure codes from PROCEDURES or codes from the MEDICAL_RECORDS file that refer to a terminated or ongoing pregnancy
ITEMSETS: routine health variables that are populated only when a woman is pregnant
A pregnancy may have records in different streams. The subsequent figure shows the number of absolute pregnancies, divided by the highest quality stream in with the pregnancy is retrieved, and anchored to the pregnancy start year.
As reported in the sap, some records have both pregnancy start date and pregnancy end date available, for others one or both of these dates are imputed. Therefore, the quality of the record depends on both the stream and the imputation. The complete list with the hierarchy of the fifteen different qualities is given below:
EUROCAT: both pregnancy_start_date and pregnancy_end_date are recorded
PROMPT: both pregnancy_start_date and pregnancy_end_date are recorded
ITEMSETS: both pregnancy_start_date and pregnancy_end_date are recorded
CONCEPSETS: pregnancy completed and pregnancy_start_date recorded
PROMPT: pregnancy completed and pregnancy_start_date not available and imputed
ITEMSETS: pregnancy completed and pregnancy_start_date not available and imputed
CONCEPSETS: live birth, meaning non primary care, pregnancy_start_date not available and imputed
CONCEPSETS: pre-term birth, meaning non primary care, pregnancy_start_date not available and imputed
CONCEPSETS: still birth, meaning non primary care, pregnancy_start_date not available and imputed
CONCEPSETS: interruption, meaning non primary care, pregnancy_start_date not available and imputed
CONCEPTSETS: spontaneous abortion, meaning non primary care, pregnancy_start_date not available and imputed
CONCEPTSETS: ectopic pregnancy, meaning non primary care, pregnancy_start_date not available and imputed
CONCEPTSETS: meaning implying primary care, pregnancy_start_date not available and imputed, end date estimated with record date
all Streams: ongoing pregnancy and pregnancy_start_date recorded
all Streams: ongoing pregnancy having pregnancy_start_date not available and imputed
The subsequent figure shows the number of absolute pregnancies retrieved, divided by the highest record quality in the pregnancy, and anchored to the pregnancy start year.
The number of pregnancies is also shown in the table below.
The same analysis is done for each of the five different types of end of pregnancy, which are:
LB : live birth
SB : still birth
T : termination
SA : spontaneous abortion
ECT : ectopic pregnancy
UNK : unknown
## [1] "there is no SB among the types of end of pregnancy"For each pregnancy the difference (in days) between the date of the first record retrieved and the date of beginning of pregnancy is calculated. The sebsequent graphs show the distribution of this distance for each type of end of pregnancy.
## [1] "there is no SB among the types of end of pregnancy"The graph shows the absolute number of excluded pregnancies for each year, divided by reason for exclusion.
The total number of excluded pregnancies is 40, the reason is shown in the following table.
In the reconciliation outcomes, two records of the same pregnancy can be:
concordant: equal start and end dates;
slightly discordant: start and end date different by no more than 7 days;
discordant: start and end date different more than 7 days;
inconsistent: when a red record is not included between the beginning and the end of the pregnancy.
The next graph shows the percentage of pregnancies that have non-concordant records. A pregnancy can be composed of both concordant and discordant records, the graph shows the number of pregnancies with at least one of the outcomes.
In the next table the absolute number of pregnancies included and excluded is reported.
The following table shows the reason for exclusion:
GG_discordant_end : two green records are discrepant on the date of end of pregnancy
GG_discordant_start : two green records are discrepant on the date of start of pregnancy
Insuff_quality: there are no records of sufficient quality in the pregnancy
Pregnancies N
The next analysis will take into account only those pregnancies that have not been excluded
The following table describes the distribution of the age of start of pregnancy, divided by type of end of pregnancy.
The next table describes the absolute number of pregnancies (and the percentage in parentheses) divided by age bands and type of pregnancy end.
The following table shows the mean of records retrieved for each pregnancy. In parentheses is the standard deviation.
Mean (SD)
For each pregnancy multiple records are reconciled, the next table describes what quality of records represents the pregnancies.
The following table describes the meaning end dates.
The following table describes the meaning start dates